Well it looks like you run it to the both.

Its almost perfect but once into windows it thinks a few buttons are still pressed. Possibly after the next version that is connector-less (built in to the sega) it may work even better.

In the end it should be a sega model 1 with working headphone port out the front. power plug is in the original spot. There should be VGA, s-vid and composite video out as well as either left and right channel out or just another headphone jack out the rear.
built in wifi and possibly bluetooth if ya want to use a kbrd/mouse with it. Maybe a rear mount USB. Plenty of room in the case so it should be pretty awesome in the end.
The motherboard is already fit into the case. Already sourced a sub $20.00 video conversion box that should fit inside the case.